RBT will be compounded at the Baragwanath hospital using 150mg Mycobutin capsules. Rifabutin suspension will be provided by the study as a 14 day supply. While there is currently no commercially available RBT dosage form for use in children, rifabutin has been compounded as a suspension for easy use in children and was found stable for 12 weeks at 4 to 40 °C [27].